<?php $input = 'S1G6AB'; // given this $store = '5I6GAB'; // actually this $regex = implode('', array_map(function ($c) { $map = ['S'=>'[S5]','5'=>'[S5]','1'=>'[1I]','I'=>'[1I]','G'=>'[6G]','6'=>'[6G]']; return (array_key_exists($c, $map) ? $map[$c] : $c); }, str_split($input)));echo (0 < preg_match("/$regex/", $store) ? 'Match' : 'No match');
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